%%%-----------------------------------------------------------------------------
%%% Copyright (c) 2012-2016 eMQTT.IO, All Rights Reserved.
%%%
%%% Permission is hereby granted, free of charge, to any person obtaining a copy
%%% of this software and associated documentation files (the "Software"), to deal
%%% in the Software without restriction, including without limitation the rights
%%% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
%%% copies of the Software, and to permit persons to whom the Software is
%%% furnished to do so, subject to the following conditions:
%%%
%%% The above copyright notice and this permission notice shall be included in all
%%% copies or substantial portions of the Software.
%%%
%%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
%%% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
%%% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
%%% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
%%% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
%%% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
%%% SOFTWARE.
%%%-----------------------------------------------------------------------------
-module(emqttc_opts).

-export([merge/2]).

%%------------------------------------------------------------------------------
%% @doc Merge Options
%% @end
%%------------------------------------------------------------------------------
merge(Defaults, Options) ->
    lists:foldl(
        fun({Opt, Val}, Acc) ->
                case lists:keymember(Opt, 1, Acc) of
                    true ->
                        lists:keyreplace(Opt, 1, Acc, {Opt, Val});
                    false ->
                        [{Opt, Val}|Acc]
                end;
            (Opt, Acc) ->
                case lists:member(Opt, Acc) of
                    true -> Acc;
                    false -> [Opt | Acc]
                end
        end, Defaults, Options).


